What thickness is required for the underlayment when installing sheet vinyl flooring?

The recommended thickness for the underlayment when installing sheet vinyl flooring is generally 1/4 inch. This thickness provides a suitable balance of support and cushioning for the vinyl while helping to prevent moisture from seeping through and causing damage to the flooring. A thicker underlayment, such as 1/2 inch or 5/8 inch, may not be necessary and could lead to issues with the overall installation, such as excess flexing or reduced adherence of the vinyl. On the opposite end, an underlayment that is too thin may not provide adequate cushioning or moisture resistance, which could compromise the durability and lifespan of the flooring. It is important to adhere to the manufacturer's specifications for underlayment thickness to ensure the best installation method and performance of the flooring material.